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Wacom touch screen are extremely accurate, but can only be operated with a stylus. Capacitive touch screens are rather less accurate, but can be operated with a finger. Pretty much all modern smartphones (and the iPad) have a capacitive touch screen.
Wacom screens do use a small amount of power, but not really enough to noticably affect battery life - for one thing, the touch screen is always powered off when you put the device into standby mode. I have a BeBook Neo, which has a Wacom touch screen, and it works extremely well.
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